HowTo convert .mp3 to .wav

["Vegard Lundby Rekaa" <vegardlr@student.matnat.uio.no>]

I have used cdparanoia to rip a cd, and now I have several .wav files I
wat to convert to .mp3.

How do I do it?

I've tried grip, but I get this errormessage every time:

Error: Unable to initalize [/dev/scd0]
-- 
System info:
  Debian Sarge GNU/Linux
  Kernel Image 2.4.27-1-386

Cheers, Vegard